Stepwise conversion of oxiranes to allylic alcohols by iodotrimethylsilane and DBU
作者:Hideki Sakurai、Koshi Sasaki、Akira Hosomi
DOI:10.1016/s0040-4039(00)92598-x
日期:1980.1
Iodotrimethylsilane, prepared from hexamethyldisilane and iodine reacts smoothly with oxiranes to give (2-iodoalkoxy)trimethylsilanes which can be converted to allylicalcohols with DBU in good yields. The whole conversion can be carried out in one-pot operation.
Properties of the methyllithium species Li4(CH3)3+, Li4(CH3)2+, Li4CH3+, Li2CH3+, LiCH3+, and Li2(CH32 have been probed by the application of an ab initio computational procedure. These lithiumcluster species are the methyl analog of the products observed experimentally to result from the fragmentation of ethyllithium and t-butyllithium. The procudure was used to determine the optimum geometry for
Sodium Diisopropylamide in Tetrahydrofuran: Selectivities, Rates, and Mechanisms of Alkene Isomerizations and Diene Metalations
作者:Russell F. Algera、Yun Ma、David B. Collum
DOI:10.1021/jacs.7b05218
日期:2017.8.23
for the metalation of 1,4-dienes and isomerization of alkenes. Dienes metalate via tetrasolvated sodium amide monomers, whereas 1-pentene is isomerized by trisolvated monomers. Facile, highly Z-selective isomerizations are observed for allylethersunderconditions that compare favorably to those of existing protocols. The selectivity is independent of the substituents on the allylethers; rate and